The Tiagra 4700 10 Speed Rear Derailleur from Shimano gives high level performance at a low price, making it accessible to all riders. This rear mech offers pro-level features such as advanced light action, which gives you low friction shifting both up and down the block and wide link design which increases rigidity and service life. The alloy body and outer link leads to lower weight without compromising it's strength and durability. The jockey wheels are both 11 tooth, to give reduced wear and chain noise and there is two fluorine-coated link pin bushings which also help give low-friction performance. Available in GS (mid/long- cage) or SS (short cage), Black only.